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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c26dfab6bdf23367d0a2c62762ae6361bb05142c6f39205b85bff839a4caf3' 
  AND token = '+4gwqHGe8F1k0WdUprqwsB7McUj0iZm2jMm7OuIOXt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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