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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f527d7df9c8ab45021e9d5bab287d5e379c6cda5f610ab25fdb73be97f85d7c' 
  AND token = 'uo6PR6410lLukgz9T3WBDcSS2MZ++IEDPRBGDqLNwTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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