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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2a7e3a26d241697139453ae402ddd95219c8a1c69957b222b235865ca4aba5' 
  AND token = 'TYazjQ2h/ll0hiMqs62HbC94kK5M0yFITv+U1FqXq1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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