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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e030e92b0329e2da5b2c17bc5ecc3ce2e531890101f36cb83df11c65bcf54bff' 
  AND token = 'pIg+RUd3qAJX8Wj+rr6Y6HUkSr+Mnt+ojFQFp68L7BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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