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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e07162f3ee52d4b35556c18b3d3025c9e395e377f6ddd0fb7b0d078100f7c92' 
  AND token = 'hKYK38nfYzO5QpG2p4W3PPeDFl0+gtOYYbODDo6LhLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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