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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b5a46572f3f95dd97f6372dd7145ab7d32307f0e8c48208e8e3f97674db937' 
  AND token = 'A7vVv1QO8217/vwqCbEBB5+0sG3LH77yIfPSYDEmEAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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