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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd43610370be02a3a1e98b7b28c12021fc6a562835fb0261748d88503482ff9' 
  AND token = 'XSJfH+Rlbc1nlpTvSB6lP79WUiertgV18oqS5DaMHnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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