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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f665141ce7f437c54fa0b6707961c821d01d905c1189fbb61dbc290874744636' 
  AND token = '0HbMC+NGt8kHDky+GJCU7yz3x5iAuzQtZgZtWSxfN4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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