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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e28b6efb250c43d525fbae91bde6987db4f435c2b82664c4cec6cb8e426b732' 
  AND token = '3tik2UvQg4cdMvP/Df5NfuANTe/cVtdEWChRQ7AotV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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