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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c67a68513a653e7b9e0b2febc4a4bb3b955fb4e2e5b2fbf6612c7dfdad09cea' 
  AND token = 'vOXhs/p3PvmE0gjamnlqbyzayd+ARQIXwuHrLB45Hn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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