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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098b49cc665ceb93aa1e307942b0fc8580007b761c39d4d3192e14eddc3309d3' 
  AND token = 'ClE2uwgYr7rdqq7GFidl1gKmxBorkOlh6wlinm5LiUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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