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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a720a7cc86b45ff2dbf4d2a8fa05ee16505a29f06960aa8ddd6157b8e2392b' 
  AND token = 'sJ+1doWsu5Bu7wScxZZBsGUA3yEKilT5+MpUI20cLBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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