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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2436300fae4690f8486f5442ae5709fe00ac327d42ccbbe00aa13bd831e3a8a5' 
  AND token = '80197WiAHyyxHiNFnk3YZUZ4gZC7DzBp/8V1Yfyj940=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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