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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcf2787f107f5d407afa7b51e0379f770658ac5a346b1ce77c482c699904111' 
  AND token = 'jNgBdrZt3VwBSCRExsgDQ675lDsm+HZd33PuFYmiCkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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