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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54b82c6e367b530d036e084358a0954fbfffd4571e9d1cb28089c341cd5ff60' 
  AND token = '7NrEzs6q5ZI16yT9WEGKNVNkHZb1Z6EA6UpYoEGvjpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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