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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb4ea2edcde5d59bfb543e3e1250429365c955456aca772706b9d9547f41ac5' 
  AND token = 'Xy5ISpI6iti6jUUmy2VHjLdG7raqdG/T1x1r0/einzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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