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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473f15325270060db6880af5373a33cbd244840faa58a92618497e9c51f702d4' 
  AND token = 'Twde9pBLUz2LclPjWP5PjU8kEvYaIbdSGkkYeNPqUSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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