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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a38e76d7f571d87709d7e0ade585bf86d6e7d990d3d381bfb663fc1f6e37b9' 
  AND token = 'h4/feOKDZRXVUxSqarU9CMANFbgzMrsWKalS+lw/c2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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