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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2654f3f39ec723c4568a723003675ef19be283f672d0063a32fc6d835aa0d453' 
  AND token = '1AKIEBjrXgyKiFBsitONiGHhVC5MgWTczQrU93UPLM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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