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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202dbb03cdc68817338570a41f8a0c0083932501db2578b78b162e1fbc48e278' 
  AND token = '/elwGzNwTGxgZoc9LkIaAU2P+75881C+qV1Hkp9F/sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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