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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c19aab59e043c91e7dac0f8aa6c404e9c3a0886e7a0d3bba672fb3a68bc2f1c' 
  AND token = 'b+SfWFZQ3Quwm4QrlcFWagv8WXYALbNHpM9DJoimW6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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