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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c65824ba0e3d6c0ffb322bc329d71b4d63856e48b985917ee7dfe64afd297f56' 
  AND token = '8y9Rx6xfhtVMVxMEUZxmEb5HIr2zaAtK8/dyzEHowAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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