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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9723344a6a2442d897809f76811adb24884de93b90d417e1ac7e56689c5929b' 
  AND token = 'aXxUeoEinM1WVJzsTAKLAmvh4dYvcwAwo0gsoho0/dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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