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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2a32c3d63656539f370e586771eb63dd7e05b73550a8c6da00330038ed7c63' 
  AND token = 'ixUigfYkuCGbfZu9m0JYo9eKe8C405Y6xgeTZKHhYTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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