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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2b646ab0de13dd02a5490ab86e51d7b16c93b48cbcb376cf2239bcc3c31e75' 
  AND token = '44z+DCwSyGAl3CkHuEXWXLtR7LK/TVz3miAldXt/myY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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