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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4b73a5e799a289e52160546d6aed9b2f8cf0b8a6336b25d91e3c095bde35ba' 
  AND token = 'AsKzY1doU1+RdkJlkArE+HZuTERpnndVikmzDFbxswk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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