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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a551730612724d9ab6210798530240a4478c278ec5205b860b68f1bbd90f51c' 
  AND token = '1UAfZHGpZs6fwP1dKlyKtV/O7EpH96SEdbTHhsAdok4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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