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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e6bc0a0adc8369ebe4c3a0d7fa1dfffec71421dfed80e53908ef39695671040' 
  AND token = 'Ebw7gYvbXkZEUMNS7t7tJN2eaXU3NB61GbcK1sCYSJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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