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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6e8c618ea1d7f480d212fe8ebb15e50883f8cf34cff4e3180ad72c88f9ff38' 
  AND token = 'jJZG8UsnhwxX0nrCl5EXGh8EMORcI5CSXlnl7osWdIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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