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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e8c3ab6b1c265d3b0ece482f715dd2727672d3e388098230c7b962156bffcf' 
  AND token = 'N+ozfCcT6HIxRUfLcHCUkgWO3CFb/B2qqHDYhsVS97M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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