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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70092837196a167056d84ee4f4197d95494e66d9cc3496c369cc8098a4990b1a' 
  AND token = 'W/2Yk3GAB+oJm1Ih82N0emL16lGTzgRS5Zi+bxSqlAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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