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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f1d422636d450da9daf2d11646232261b79546f77239b82e69f9d86241ff90' 
  AND token = 'yP9IQ2lOq4MTasHiqpUQ9OmFu3kaNiOd9/htBnevrhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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