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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff94746ab26771a63bc7bd65932e49829045bd49be55d4b81b06fb27ce87d20' 
  AND token = 'Yp2CxUWX61OsNohcM8lw75Y8oj9MABYIGG1W5IFkvq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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