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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2682833c4bfc1a238141ba61e1bec3107ce3ce69acd7b9293d86c3499b08b99' 
  AND token = 'tGoKLbgHug6m7wLH8sb23IY6Eirfh+BVNinqLijNIpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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