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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20714ddecabd5406f71588baba2e3144485299f6400d6a304e1f320c7c90d1c' 
  AND token = '63/dAwlwnI5n+OqR0dJ3te3w2RhUbo7CC6EWZNkzECg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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