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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6eb476707f65566a6a14c87c9a21579d6cd8a598decbbaf554b911493066df8' 
  AND token = 'jlj8Yptl3uWPpc65OGvUDWVLRwNv7sjzJs5WRDqnpis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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