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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fde1948b188cca06a094550087e8e90825bb0682308e731562951188e4491fb' 
  AND token = 'Pn7DyghIrp5JjD0hWKjvJNMSKK+edQW2M1ozjCD/cGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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