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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b9cb0e6f38a88783a1e5267b84b0f3d52f7e1e73f5858274bf5c84354c53ce' 
  AND token = 'FjGc8a4ZHtb4F1RqAXoE0rWIWlFKk1mHdl9/IBBUF/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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