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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a596c45ca77c7aebb33841bb36c1612a78676fd6a936ecf0772356502f1818' 
  AND token = '2SZE2lU6V5TOo5PJW71c7ryIyHau2FweIvuW63kgvsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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