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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd886f90b8f17322e2db0f3ad240ec656a2783e9dfefa2f2852695b795e07becb' 
  AND token = '5+7PCX8d0p2FfZDV6nCEEWhxPFmmhV6KB9Dr9+sLHRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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