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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be8b2f3b006e03382b32288b00837f78a1233114da0a8795233f117be87561a' 
  AND token = '0krlgTIJGM+7VWgzIwVgUkJgU7mMWuyACuMel3mKoCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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