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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3d7ee26e9887e76091a8d360035943b5918ecd97289372421c389b837a3965' 
  AND token = 'VdALE1WqKj1FPp/Hi/rJ66Z+Mcn00xzV+eq8/zxsy0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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