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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f6859a8872d8a975b7a900b9c4d8ce8c5034aa9a43093d6d73d9e0da7badea' 
  AND token = 'h1KRxrXnebfdCynLwvXs3asr7kLMkggejdaGX45ODKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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