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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '325c2ddad7e60ac56a4fb2ffbfb156e7a2ca9ff6158ce90d370d712e7a984f23' 
  AND token = 'iLwRWhuyXYluz4WzEDrJUcAk1JQEBEmimBzITQf+/o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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