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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3846d3c8cd242f3ad09fe948c4ad825741fb2ab3746b9c3f3094e8ab0480fc' 
  AND token = 'hBOiPAEq9swX1KlZro0W8TNLZaeKrBNqgp4FbCvCsDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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