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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5e696f816f2de8359b2c0a563db261b09ef923be7e026829a8b5a823bf4cd5' 
  AND token = 'ahd+afcjnQkGYBy/XCQMOh9XjrX6yYb6O6M6m0KU/c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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