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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275eb1add3b6dd894d181f583d70bc9dac511f148b23caa9248335d8513a7e22' 
  AND token = 'J8BYpv7CTiNgMRxRWTbyYc8x7lMOgJ5PYZ5/Q8nERew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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