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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5019980afdb547e4f79ca824a3fe96edd37c09da4dd34090ef518f480d67235f' 
  AND token = '7A0VvhgTyMInl2HnNWYfcxyRYI/vBq+rMNHTNdDoj/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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