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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be83b40f302a0afc8df9b9d72f7f3bf15a76a76082d73ad7ef1f44ace5863186' 
  AND token = '4Au39A9lBwGeHNEzUjnAgePA7qMHxPrWi0flR7vjUsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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