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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ef8c4be7ca211e9f71aa8be8bcf6760de36c052baaa3a6e47a4082f7ce241c' 
  AND token = 'pLqJ8oX+TwwHvpJwZOnXlMXb807+m9GKBak+PXvwZD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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