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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a35a64cf6db30a0da6b3b95a5379541e35c9ad45c334e9ac474c4ebdb73e79' 
  AND token = 'HDh7q76OOyy731xMajVPB59poj5655J58X08cUv3qx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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