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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dac9bff5212d196078699496d805eaaa98fa90a728c44e8fb4970e1ba02508c' 
  AND token = 'I9raHsAWnk/bSDMdDUWSc+NVJKx3m4e+zn6lDDS5WcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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