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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2982c035400090c862a03649c0a3ac4ff38d26e893284d0803e0a7ab5bd12c1d' 
  AND token = '9RFre+vVg32FhXKlekQYETQoO8NqQfU4N9rAdYOLfrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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