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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce5792fc2264178855faa0fa604c7432ef5c4ba89564fdddf39d3aabf3105f5' 
  AND token = 'uhxAMD7xPhpFVtfSAYS3OeD1piMUm+G94h0r6M1w6KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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