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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f220a3679ad6f0cabdad9ca2f1926804eecbe3d69fa76be8b5fd99e862c9e315' 
  AND token = 'uEk/eHocSqzPtUKGkloudevpE/K57rIDpMKdfu77lGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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