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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bfd1bb5c3bfe22a40f10c3a4e61eee4bd4e530ed265514b92f88a4314b70be' 
  AND token = '90ZkhdcKMPISm0LTOuZEhDyL9LNPPoR2L24X0r1LCEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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