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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ab7037127f944871dfe70f284ddf30116e7265138fea7a0b843465795a4004' 
  AND token = 'BG3QSgS9PVOHsM8BQ0FesUtVvceyZn13OXILPBC4qgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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