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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a631187fb3dd3feae51e655658b1857f3bea6788ac884702ea829faea9ba0f4' 
  AND token = '3RClehkMI6SZx8H0l72Oz8FwTuHYRQH885iWeDkpTz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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