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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ba7624ed6b974d89a8d692a1977c99c4272c98f3b3308c7d48af6d928df706' 
  AND token = 'jU8gRdKFTtIzJ0basHXLMDOrs82utkUoScPuhHLILAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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