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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c2ac2a7329a061ba2ca83acde13db003f68c768dfd1596d016bd7ddc32a146' 
  AND token = 'ltSILXOPrdBfaOvDpQ75900HA8q0Jph6OjvTOXsLy88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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