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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e05302e9c0f6e2481d538622c09eb3e16642aedf86a0b4782dbefe4b969247e' 
  AND token = 'M5nK8zxUGCUOXXid4K3qWvN5tuUu6qSvuEHy1HZSYrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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