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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2e81c55b4a164e9bf2f9d7781a690b1187ecd17182a51e3f83fbc20afdedf1' 
  AND token = 'lDDZFsKujdFV0DItF3GYMN4805HvT7G5Ho9k25btlTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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