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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cea432f4b07462e0258f2d04fe132de381440cb51c8d5a7674634c1cc279a78' 
  AND token = 'ebs9vQSznfRk3StJ6reTa6zrydLKfFbQ2mK4G2s7cds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}