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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f714c1d072cb3598507e817f48635a78105799b474da61030b32d6ae588540e' 
  AND token = 'GNObXt07+JICT4VKTLgCDA44PCCk9OT1T33Ty2SfPMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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