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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69041f1fb2ea6a2b13e40cbc2b04ac56f00d18d0133d2771c4d4352eba75a19' 
  AND token = 'B9TwgesNL/mBTwffbKHDD7xAq2EVVYqDK6UVzT9GuF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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