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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57d257332a13932fb39e189fe8eb09428c1460cbc96d35823dc41f6786c9f13' 
  AND token = 'sE1OrxhFNCQ6/WSLqcjOdkFXFG3y8I1eihf+1TvBcAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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