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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6d886e236b4fcf5ca83620d6c10dec534175e3a54cdab47e90778709b8e0ba' 
  AND token = '8nLpba7Z9S9rGpvM8eeeZEyqG/D8CYJrmPfmmGAdJ88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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