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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6152baa4b2490f812b8a70ce8c5b3b3735385fdc4e05e314b86332e78a1155e8' 
  AND token = 'GvrFynI4/tAWfWJzEz0xGNLGDSxgWEyHd8NJ3uLOyCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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